Отраслевые подборки (УДК)
Издания подборки 11 - 20 из 1335
11.

Количество страниц: 20 с.

Mouchkambarov, N. N. Discussions sur la gérontologie : modélisation mathématique et méthodes de vulgarisation / Nikolay Mouchkambarov, Grigori Tomski // Bulletin de l’Académie Internationale CONCORDE. - 2020. – N 2. – С. 39-58.

12.

Количество страниц: 24 с.

Riesz potentials are convolution operators with fractional powers of some distance (Euclidean, Lorentz or other) to a point. From application point of view, such potentials are tools for solving differential equations of mathematical physics and inverse problems. For example, Marsel Riesz used these operators for writing the solution to the Cauchy problem for the wave equation and theory of the Radon transform is based on Riesz potentials. In this article, we use the Riesz potentials constructed with the help of generalized convolution for solution to the wave equations with Bessel operators. First, we describe general method of Riesz potentials, give basic definitions, introduce solvable equations and write suitable potentials (Riesz hyperbolic B-potentials). Then, we show that these potentials are absolutely convergent integrals for some functions and for some values of the parameter representing fractional powers of the Lorentz distance. Next we show the connection of the Riesz hyperbolic B-potentials with d’Alembert operators in which the Bessel operators are used in place of the second derivatives. Next we continue analytically considered potentials to the required parameter values that includes zero and show that when value of the parameter is zero these operators are identity operators. Finally, we solve singular initial value hyperbolic problems and give examples.

Shishkina, E. L. Method of Riesz potentials applied to solution to nonhomogeneous singular wave equations / E. L. Shishkina, S. Abbas // Математические заметки СВФУ. — 2018. — Т. 25, N 3 (99), июль-сентябрь. — С. 68-91.
DOI: 10.25587/SVFU.2018.99.16952

13.

Количество страниц: 4 с.

The Dst-index obtained by hourly average values of the magnetic field at four stations located in various longitudinal sectors at latitudes Φ′≈20-30° is the index of magnetic field depression at low latitudes during the magnetic storm periods. Recently for the characteristics of magnetic field depression the SYM-H index has been used. It is obtained from 1 min data of the magnetic field at ~10 stations, located mainly at latitudes Φ′≈40-50° [1]. It is considered in [2-4] that the SYM-H index is an analog of Dst but with a better temporal resolution. As shown in [5], during super magnetic storms with Dst variation ≥ 400 nT, the SYM-H variations can considerably differ from Dst behavior and thus the SYM-H index is not always an analog of Dst. In this paper the relation between the Dst and SYM-H variations for magnetic storms of different intensity, with Dst varying from ~ -50 nT to -450 nT is investigated.

Solovyev, S. I. On the relation between the SYM-H and Dst- indices during the development of magnetic storm / S. I. Solovyev, R. N. Boroyev, A. V. Moiseyev // Physics of auroral phenomena : proceedings of the 28 th annual seminar, 1-4 March 2005. – 2005. – P. 48-51.

14.

Количество страниц: 1 с.

Sources of excitation and damping of PC5 geomagnetic pulsations during the magnetic storms of october 29-31, 2003 influence of the solar wind and auroral electrojets : [тезисы докладов] / Solovyev S. I., Moiseyev A. V., Du A., Engebretson M., Newitt L. R. // International symposium on Solar Extreme Events of 2003 : programme and abstract book. – Москва : УНЦ ДО, 2004. – P. 59.

15.

Количество страниц: 1 с.

Sources of excitation and damping of PC5 geomagnetic pulsations during the magnetic storms of october 29-31, 2003 influence of the solar wind and auroral electrojets : [тезисы докладов] / Solovyev S. I., Moiseyev A. V., Mullayarov V. A., Du A., Engebretson M., Newitt L. R. // International symposium on Solar Extreme Events of 2003 : programme and abstract book. – Москва : УНЦ ДО, 2004. – P. 60.

17.
Автор:

Количество страниц: 2 с.

Sinosalda insolita Vinokurov, 2004 - реликтовый вид, распространённый на севере Центрального Китая, был известен по единственному самцу. В коллекции Китайского аграрного университета в Пекине обнаружена одна самка, описание которой приводится в настоящей статье.

Vinokurov, N. N. Description of Sinosalda insolita Vin. female (Heteroptera, Saldidae) from China / N. N. Vinokurov // Евразиатский энтомологический журнал. – 2014, Т. 13, N 5. – С. 471-472.

18.

Количество страниц: 12 с.

Voin, A. M. Sur les theories scientifiques et la methode unique de leur justification / Voin Alexander, Tomski Grigori ; Institut international des problèmes de la philosophie et de la société, Académie Internationale CONCORDE // Concorde. – 2019. – N 4. – С. 3-13.

19.

Количество страниц: 2 с.

В итоге анализа геногеографической дифференциации популяций Pinus sylvestris L. установлено, что отдельные популяции Якутии отчетливо подразделяются на две группы — западную и восточную. Между тем, региональные группы якутских популяций (в бассейнах Лены, Алдана и Вилюя) слабо генетически подразделены. Но их генофонд дифференцирован от групп популяций Средней Сибири, Забайкалья и Приамурья.

Геногеографическая дифференциация популяций Pinus sylvestris L. в Центральной Якутии / Д. С. Абдуллина, И. В. Петрова, А. П. Исаев [и др.] // Аграрный вестник Урала. – 2011, N 11 (90). – С. 20-21.

20.

Количество страниц: 2 с.

Абрамова, М. Н. Интеллектуальный турнир "Биофизбой" как средство развития метапредметных умений и навыков во внеурочной деятельности обучающихся 10-х классов / М. Н. Абрамова, С. В. Иванова // Народное образование Якутии. - 2021. - N 4 (121). - С. 89-90.